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   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/config.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/sched.h>
  35 #include <linux/net.h>
  36 #include <linux/in6.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/init.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/netfilter.h>
  42
  43 #include <net/sock.h>
  44 #include <net/snmp.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/inet_common.h>
  52 #include <net/tcp.h>
  53 #include <net/udp.h>
  54 #include <net/xfrm.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
  59
  60 static struct packet_type ipv6_packet_type = {
  61         .type = __constant_htons(ETH_P_IPV6),
  62         .func = ipv6_rcv,
  63 };
  64
  65 struct ip6_ra_chain *ip6_ra_chain;
  66 DEFINE_RWLOCK(ip6_ra_lock);
  67
  68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  69 {
  70         struct ip6_ra_chain *ra, *new_ra, **rap;
  71
  72         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  73         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  74                 return -EINVAL;
  75
  76         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  77
  78         write_lock_bh(&ip6_ra_lock);
  79         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  80                 if (ra->sk == sk) {
  81                         if (sel>=0) {
  82                                 write_unlock_bh(&ip6_ra_lock);
  83                                 if (new_ra)
  84                                         kfree(new_ra);
  85                                 return -EADDRINUSE;
  86                         }
  87
  88                         *rap = ra->next;
  89                         write_unlock_bh(&ip6_ra_lock);
  90
  91                         if (ra->destructor)
  92                                 ra->destructor(sk);
  93                         sock_put(sk);
  94                         kfree(ra);
  95                         return 0;
  96                 }
  97         }
  98         if (new_ra == NULL) {
  99                 write_unlock_bh(&ip6_ra_lock);
 100                 return -ENOBUFS;
 101         }
 102         new_ra->sk = sk;
 103         new_ra->sel = sel;
 104         new_ra->destructor = destructor;
 105         new_ra->next = ra;
 106         *rap = new_ra;
 107         sock_hold(sk);
 108         write_unlock_bh(&ip6_ra_lock);
 109         return 0;
 110 }
 111
 112 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 113         struct group_source_req *pgsr);
 114 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 115 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 116         struct group_filter __user *optval, int __user *optlen);
 117
 118
 119 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 120                     char __user *optval, int optlen)
 121 {
 122         struct ipv6_pinfo *np = inet6_sk(sk);
 123         int val, valbool;
 124         int retv = -ENOPROTOOPT;
 125
 126         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 127                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 128
 129         if(level!=SOL_IPV6)
 130                 goto out;
 131
 132         if (optval == NULL)
 133                 val=0;
 134         else if (get_user(val, (int __user *) optval))
 135                 return -EFAULT;
 136
 137         valbool = (val!=0);
 138
 139         lock_sock(sk);
 140
 141         switch (optname) {
 142
 143         case IPV6_ADDRFORM:
 144                 if (val == PF_INET) {
 145                         struct ipv6_txoptions *opt;
 146                         struct sk_buff *pktopt;
 147
 148                         if (sk->sk_protocol != IPPROTO_UDP &&
 149                             sk->sk_protocol != IPPROTO_TCP)
 150                                 break;
 151
 152                         if (sk->sk_state != TCP_ESTABLISHED) {
 153                                 retv = -ENOTCONN;
 154                                 break;
 155                         }
 156
 157                         if (ipv6_only_sock(sk) ||
 158                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 159                                 retv = -EADDRNOTAVAIL;
 160                                 break;
 161                         }
 162
 163                         fl6_free_socklist(sk);
 164                         ipv6_sock_mc_close(sk);
 165
 166                         /*
 167                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 168                          * remove it from the refcnt debug socks count in the
 169                          * original family...
 170                          */
 171                         sk_refcnt_debug_dec(sk);
 172
 173                         if (sk->sk_protocol == IPPROTO_TCP) {
 174                                 struct tcp_sock *tp = tcp_sk(sk);
 175
 176                                 local_bh_disable();
 177                                 sock_prot_dec_use(sk->sk_prot);
 178                                 sock_prot_inc_use(&tcp_prot);
 179                                 local_bh_enable();
 180                                 sk->sk_prot = &tcp_prot;
 181                                 tp->af_specific = &ipv4_specific;
 182                                 sk->sk_socket->ops = &inet_stream_ops;
 183                                 sk->sk_family = PF_INET;
 184                                 tcp_sync_mss(sk, tp->pmtu_cookie);
 185                         } else {
 186                                 local_bh_disable();
 187                                 sock_prot_dec_use(sk->sk_prot);
 188                                 sock_prot_inc_use(&udp_prot);
 189                                 local_bh_enable();
 190                                 sk->sk_prot = &udp_prot;
 191                                 sk->sk_socket->ops = &inet_dgram_ops;
 192                                 sk->sk_family = PF_INET;
 193                         }
 194                         opt = xchg(&np->opt, NULL);
 195                         if (opt)
 196                                 sock_kfree_s(sk, opt, opt->tot_len);
 197                         pktopt = xchg(&np->pktoptions, NULL);
 198                         if (pktopt)
 199                                 kfree_skb(pktopt);
 200
 201                         sk->sk_destruct = inet_sock_destruct;
 202                         /*
 203                          * ... and add it to the refcnt debug socks count
 204                          * in the new family. -acme
 205                          */
 206                         sk_refcnt_debug_inc(sk);
 207                         module_put(THIS_MODULE);
 208                         retv = 0;
 209                         break;
 210                 }
 211                 goto e_inval;
 212
 213         case IPV6_V6ONLY:
 214                 if (inet_sk(sk)->num)
 215                         goto e_inval;
 216                 np->ipv6only = valbool;
 217                 retv = 0;
 218                 break;
 219
 220         case IPV6_PKTINFO:
 221                 np->rxopt.bits.rxinfo = valbool;
 222                 retv = 0;
 223                 break;
 224
 225         case IPV6_HOPLIMIT:
 226                 np->rxopt.bits.rxhlim = valbool;
 227                 retv = 0;
 228                 break;
 229
 230         case IPV6_RTHDR:
 231                 if (val < 0 || val > 2)
 232                         goto e_inval;
 233                 np->rxopt.bits.srcrt = val;
 234                 retv = 0;
 235                 break;
 236
 237         case IPV6_HOPOPTS:
 238                 np->rxopt.bits.hopopts = valbool;
 239                 retv = 0;
 240                 break;
 241
 242         case IPV6_DSTOPTS:
 243                 np->rxopt.bits.dstopts = valbool;
 244                 retv = 0;
 245                 break;
 246
 247         case IPV6_FLOWINFO:
 248                 np->rxopt.bits.rxflow = valbool;
 249                 retv = 0;
 250                 break;
 251
 252         case IPV6_PKTOPTIONS:
 253         {
 254                 struct ipv6_txoptions *opt = NULL;
 255                 struct msghdr msg;
 256                 struct flowi fl;
 257                 int junk;
 258
 259                 fl.fl6_flowlabel = 0;
 260                 fl.oif = sk->sk_bound_dev_if;
 261
 262                 if (optlen == 0)
 263                         goto update;
 264
 265                 /* 1K is probably excessive
 266                  * 1K is surely not enough, 2K per standard header is 16K.
 267                  */
 268                 retv = -EINVAL;
 269                 if (optlen > 64*1024)
 270                         break;
 271
 272                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 273                 retv = -ENOBUFS;
 274                 if (opt == NULL)
 275                         break;
 276
 277                 memset(opt, 0, sizeof(*opt));
 278                 opt->tot_len = sizeof(*opt) + optlen;
 279                 retv = -EFAULT;
 280                 if (copy_from_user(opt+1, optval, optlen))
 281                         goto done;
 282
 283                 msg.msg_controllen = optlen;
 284                 msg.msg_control = (void*)(opt+1);
 285
 286                 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
 287                 if (retv)
 288                         goto done;
 289 update:
 290                 retv = 0;
 291                 if (sk->sk_type == SOCK_STREAM) {
 292                         if (opt) {
 293                                 struct tcp_sock *tp = tcp_sk(sk);
 294                                 if (!((1 << sk->sk_state) &
 295                                       (TCPF_LISTEN | TCPF_CLOSE))
 296                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 297                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 298                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 299                                 }
 300                         }
 301                         opt = xchg(&np->opt, opt);
 302                         sk_dst_reset(sk);
 303                 } else {
 304                         write_lock(&sk->sk_dst_lock);
 305                         opt = xchg(&np->opt, opt);
 306                         write_unlock(&sk->sk_dst_lock);
 307                         sk_dst_reset(sk);
 308                 }
 309
 310 done:
 311                 if (opt)
 312                         sock_kfree_s(sk, opt, opt->tot_len);
 313                 break;
 314         }
 315         case IPV6_UNICAST_HOPS:
 316                 if (val > 255 || val < -1)
 317                         goto e_inval;
 318                 np->hop_limit = val;
 319                 retv = 0;
 320                 break;
 321
 322         case IPV6_MULTICAST_HOPS:
 323                 if (sk->sk_type == SOCK_STREAM)
 324                         goto e_inval;
 325                 if (val > 255 || val < -1)
 326                         goto e_inval;
 327                 np->mcast_hops = val;
 328                 retv = 0;
 329                 break;
 330
 331         case IPV6_MULTICAST_LOOP:
 332                 np->mc_loop = valbool;
 333                 retv = 0;
 334                 break;
 335
 336         case IPV6_MULTICAST_IF:
 337                 if (sk->sk_type == SOCK_STREAM)
 338                         goto e_inval;
 339                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 340                         goto e_inval;
 341
 342                 if (__dev_get_by_index(val) == NULL) {
 343                         retv = -ENODEV;
 344                         break;
 345                 }
 346                 np->mcast_oif = val;
 347                 retv = 0;
 348                 break;
 349         case IPV6_ADD_MEMBERSHIP:
 350         case IPV6_DROP_MEMBERSHIP:
 351         {
 352                 struct ipv6_mreq mreq;
 353
 354                 retv = -EFAULT;
 355                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 356                         break;
 357
 358                 if (optname == IPV6_ADD_MEMBERSHIP)
 359                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 360                 else
 361                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 362                 break;
 363         }
 364         case IPV6_JOIN_ANYCAST:
 365         case IPV6_LEAVE_ANYCAST:
 366         {
 367                 struct ipv6_mreq mreq;
 368
 369                 if (optlen != sizeof(struct ipv6_mreq))
 370                         goto e_inval;
 371
 372                 retv = -EFAULT;
 373                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 374                         break;
 375
 376                 if (optname == IPV6_JOIN_ANYCAST)
 377                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 378                 else
 379                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 380                 break;
 381         }
 382         case MCAST_JOIN_GROUP:
 383         case MCAST_LEAVE_GROUP:
 384         {
 385                 struct group_req greq;
 386                 struct sockaddr_in6 *psin6;
 387
 388                 retv = -EFAULT;
 389                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 390                         break;
 391                 if (greq.gr_group.ss_family != AF_INET6) {
 392                         retv = -EADDRNOTAVAIL;
 393                         break;
 394                 }
 395                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 396                 if (optname == MCAST_JOIN_GROUP)
 397                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 398                                 &psin6->sin6_addr);
 399                 else
 400                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 401                                 &psin6->sin6_addr);
 402                 break;
 403         }
 404         case MCAST_JOIN_SOURCE_GROUP:
 405         case MCAST_LEAVE_SOURCE_GROUP:
 406         case MCAST_BLOCK_SOURCE:
 407         case MCAST_UNBLOCK_SOURCE:
 408         {
 409                 struct group_source_req greqs;
 410                 int omode, add;
 411
 412                 if (optlen != sizeof(struct group_source_req))
 413                         goto e_inval;
 414                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 415                         retv = -EFAULT;
 416                         break;
 417                 }
 418                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 419                     greqs.gsr_source.ss_family != AF_INET6) {
 420                         retv = -EADDRNOTAVAIL;
 421                         break;
 422                 }
 423                 if (optname == MCAST_BLOCK_SOURCE) {
 424                         omode = MCAST_EXCLUDE;
 425                         add = 1;
 426                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 427                         omode = MCAST_EXCLUDE;
 428                         add = 0;
 429                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 430                         struct sockaddr_in6 *psin6;
 431
 432                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 433                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 434                                 &psin6->sin6_addr);
 435                         /* prior join w/ different source is ok */
 436                         if (retv && retv != -EADDRINUSE)
 437                                 break;
 438                         omode = MCAST_INCLUDE;
 439                         add = 1;
 440                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 441                         omode = MCAST_INCLUDE;
 442                         add = 0;
 443                 }
 444                 retv = ip6_mc_source(add, omode, sk, &greqs);
 445                 break;
 446         }
 447         case MCAST_MSFILTER:
 448         {
 449                 extern int sysctl_optmem_max;
 450                 extern int sysctl_mld_max_msf;
 451                 struct group_filter *gsf;
 452
 453                 if (optlen < GROUP_FILTER_SIZE(0))
 454                         goto e_inval;
 455                 if (optlen > sysctl_optmem_max) {
 456                         retv = -ENOBUFS;
 457                         break;
 458                 }
 459                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 460                 if (gsf == 0) {
 461                         retv = -ENOBUFS;
 462                         break;
 463                 }
 464                 retv = -EFAULT;
 465                 if (copy_from_user(gsf, optval, optlen)) {
 466                         kfree(gsf);
 467                         break;
 468                 }
 469                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 470                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 471                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 472                         kfree(gsf);
 473                         retv = -ENOBUFS;
 474                         break;
 475                 }
 476                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 477                         kfree(gsf);
 478                         retv = -EINVAL;
 479                         break;
 480                 }
 481                 retv = ip6_mc_msfilter(sk, gsf);
 482                 kfree(gsf);
 483
 484                 break;
 485         }
 486         case IPV6_ROUTER_ALERT:
 487                 retv = ip6_ra_control(sk, val, NULL);
 488                 break;
 489         case IPV6_MTU_DISCOVER:
 490                 if (val<0 || val>2)
 491                         goto e_inval;
 492                 np->pmtudisc = val;
 493                 retv = 0;
 494                 break;
 495         case IPV6_MTU:
 496                 if (val && val < IPV6_MIN_MTU)
 497                         goto e_inval;
 498                 np->frag_size = val;
 499                 retv = 0;
 500                 break;
 501         case IPV6_RECVERR:
 502                 np->recverr = valbool;
 503                 if (!val)
 504                         skb_queue_purge(&sk->sk_error_queue);
 505                 retv = 0;
 506                 break;
 507         case IPV6_FLOWINFO_SEND:
 508                 np->sndflow = valbool;
 509                 retv = 0;
 510                 break;
 511         case IPV6_FLOWLABEL_MGR:
 512                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 513                 break;
 514         case IPV6_IPSEC_POLICY:
 515         case IPV6_XFRM_POLICY:
 516                 retv = -EPERM;
 517                 if (!capable(CAP_NET_ADMIN))
 518                         break;
 519                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 520                 break;
 521
 522 #ifdef CONFIG_NETFILTER
 523         default:
 524                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 525                                             optlen);
 526                 break;
 527 #endif
 528
 529         }
 530         release_sock(sk);
 531
 532 out:
 533         return retv;
 534
 535 e_inval:
 536         release_sock(sk);
 537         return -EINVAL;
 538 }
 539
 540 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 541                     char __user *optval, int __user *optlen)
 542 {
 543         struct ipv6_pinfo *np = inet6_sk(sk);
 544         int len;
 545         int val;
 546
 547         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 548                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 549         if(level!=SOL_IPV6)
 550                 return -ENOPROTOOPT;
 551         if (get_user(len, optlen))
 552                 return -EFAULT;
 553         switch (optname) {
 554         case IPV6_ADDRFORM:
 555                 if (sk->sk_protocol != IPPROTO_UDP &&
 556                     sk->sk_protocol != IPPROTO_TCP)
 557                         return -EINVAL;
 558                 if (sk->sk_state != TCP_ESTABLISHED)
 559                         return -ENOTCONN;
 560                 val = sk->sk_family;
 561                 break;
 562         case MCAST_MSFILTER:
 563         {
 564                 struct group_filter gsf;
 565                 int err;
 566
 567                 if (len < GROUP_FILTER_SIZE(0))
 568                         return -EINVAL;
 569                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 570                         return -EFAULT;
 571                 lock_sock(sk);
 572                 err = ip6_mc_msfget(sk, &gsf,
 573                         (struct group_filter __user *)optval, optlen);
 574                 release_sock(sk);
 575                 return err;
 576         }
 577
 578         case IPV6_PKTOPTIONS:
 579         {
 580                 struct msghdr msg;
 581                 struct sk_buff *skb;
 582
 583                 if (sk->sk_type != SOCK_STREAM)
 584                         return -ENOPROTOOPT;
 585
 586                 msg.msg_control = optval;
 587                 msg.msg_controllen = len;
 588                 msg.msg_flags = 0;
 589
 590                 lock_sock(sk);
 591                 skb = np->pktoptions;
 592                 if (skb)
 593                         atomic_inc(&skb->users);
 594                 release_sock(sk);
 595
 596                 if (skb) {
 597                         int err = datagram_recv_ctl(sk, &msg, skb);
 598                         kfree_skb(skb);
 599                         if (err)
 600                                 return err;
 601                 } else {
 602                         if (np->rxopt.bits.rxinfo) {
 603                                 struct in6_pktinfo src_info;
 604                                 src_info.ipi6_ifindex = np->mcast_oif;
 605                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 606                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 607                         }
 608                         if (np->rxopt.bits.rxhlim) {
 609                                 int hlim = np->mcast_hops;
 610                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 611                         }
 612                 }
 613                 len -= msg.msg_controllen;
 614                 return put_user(len, optlen);
 615         }
 616         case IPV6_MTU:
 617         {
 618                 struct dst_entry *dst;
 619                 val = 0;
 620                 lock_sock(sk);
 621                 dst = sk_dst_get(sk);
 622                 if (dst) {
 623                         val = dst_mtu(dst);
 624                         dst_release(dst);
 625                 }
 626                 release_sock(sk);
 627                 if (!val)
 628                         return -ENOTCONN;
 629                 break;
 630         }
 631
 632         case IPV6_V6ONLY:
 633                 val = np->ipv6only;
 634                 break;
 635
 636         case IPV6_PKTINFO:
 637                 val = np->rxopt.bits.rxinfo;
 638                 break;
 639
 640         case IPV6_HOPLIMIT:
 641                 val = np->rxopt.bits.rxhlim;
 642                 break;
 643
 644         case IPV6_RTHDR:
 645                 val = np->rxopt.bits.srcrt;
 646                 break;
 647
 648         case IPV6_HOPOPTS:
 649                 val = np->rxopt.bits.hopopts;
 650                 break;
 651
 652         case IPV6_DSTOPTS:
 653                 val = np->rxopt.bits.dstopts;
 654                 break;
 655
 656         case IPV6_FLOWINFO:
 657                 val = np->rxopt.bits.rxflow;
 658                 break;
 659
 660         case IPV6_UNICAST_HOPS:
 661                 val = np->hop_limit;
 662                 break;
 663
 664         case IPV6_MULTICAST_HOPS:
 665                 val = np->mcast_hops;
 666                 break;
 667
 668         case IPV6_MULTICAST_LOOP:
 669                 val = np->mc_loop;
 670                 break;
 671
 672         case IPV6_MULTICAST_IF:
 673                 val = np->mcast_oif;
 674                 break;
 675
 676         case IPV6_MTU_DISCOVER:
 677                 val = np->pmtudisc;
 678                 break;
 679
 680         case IPV6_RECVERR:
 681                 val = np->recverr;
 682                 break;
 683
 684         case IPV6_FLOWINFO_SEND:
 685                 val = np->sndflow;
 686                 break;
 687
 688         default:
 689 #ifdef CONFIG_NETFILTER
 690                 lock_sock(sk);
 691                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 692                                     &len);
 693                 release_sock(sk);
 694                 if (val >= 0)
 695                         val = put_user(len, optlen);
 696                 return val;
 697 #else
 698                 return -EINVAL;
 699 #endif
 700         }
 701         len = min_t(unsigned int, sizeof(int), len);
 702         if(put_user(len, optlen))
 703                 return -EFAULT;
 704         if(copy_to_user(optval,&val,len))
 705                 return -EFAULT;
 706         return 0;
 707 }
 708
 709 void __init ipv6_packet_init(void)
 710 {
 711         dev_add_pack(&ipv6_packet_type);
 712 }
 713
 714 void ipv6_packet_cleanup(void)
 715 {
 716         dev_remove_pack(&ipv6_packet_type);
 717 }